package cn.tedu.sp11.fallback;

import cn.tedu.web.util.JsonResult;
import org.springframework.cloud.netflix.zuul.filters.route.FallbackProvider;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.client.ClientHttpResponse;
import org.springframework.stereotype.Component;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;

@Component
public class OrderFB implements FallbackProvider {
    /**
     * 如果返回service-id
     * 针对其服务进行降级
     * 如果返回"" 或 null -针对多有服务进行降级
     * @return
     */
    @Override
    public String getRoute() {
        return "order-service";
    }

    /**
     * 设置向客户端返回的降级响应
     * @param route
     * @param cause
     * @return  相应内容
     */
    @Override
    public ClientHttpResponse fallbackResponse(String route, Throwable cause) {
        return new ClientHttpResponse() {
            //返回协议状态
            @Override
            public HttpStatus getStatusCode() throws IOException {
                return HttpStatus.OK;
            }
            @Override
            public int getRawStatusCode() throws IOException {
                return HttpStatus.OK.value();
            }
            @Override
            public String getStatusText() throws IOException {
                return  HttpStatus.OK.getReasonPhrase();
            }

            @Override
            public void close() {

            }

            @Override
            public InputStream getBody() throws IOException {
                //JsonResult - {code:200,msg("调用后台订单服务失败"),data:null}
              String json =  JsonResult.ok().msg("调用后台订单服务失败").toString();
                return new ByteArrayInputStream(json.getBytes("UTF-8"));
            }

            @Override
            public HttpHeaders getHeaders() {
                HttpHeaders headers = new HttpHeaders();
                headers.add("Content-Tu[e", "application/json;charset=UTF-8");
                return headers;
            }
        };
    }
}
